If you used to jam the SNES, you'd probably have a great time with the Switch. The catalogue of old games (which you may know from the past) from NES, SNES, N64, Sega Genesis, and now Gameboy/GBA is really large and quality now imo. It comes with the Nintendo Switch Online subscription. Switch also has, at least in my opinion, some of the best modern games in those old series. Mario Odyssey and 3D World, Metroid Dread, DKC Tropical Freeze, Mario Kart 8 Deluxe.

If you wanted to go *pure* nostalgia, you can get a SteamDeck and install like every emulator up to xbox 360/ps3. It's basically a small linux PC so it can be trickier to set up, but really is not bad. It could also play newer PC games from Steam, which was more the point of it. Like you can play the God of War and Horizon PS4 ports on it. Those PS4 exclusives are excellent titles.

TL;DR imo the very best way you could dip your toes back into gaming, with the best combination of new & old/nostalgic, you'd do well with a Nintendo Switch.